In order to further the administration and use of the Everglades National Park, the Secretary of the Interior is authorized to accept on behalf of the United States title to the following described parcels of land:

Those parts of tracts “R” and “S” which lie west of the right-of-way of State Road Numbered 29, and lots 1 to 9, inclusive, of block 40, in Everglades City, Florida, comprising 18.98, 1.32, and 3.17 acres, respectively, as shown on N.P.S. Map No. EVE-NP-E-1, dated June 23, 1959, of Everglades City, Florida; and not to exceed 15 acres of submerged lands lying adjacent to said tracts “R” and “S”, if such additional lands are considered necessary by the Secretary of the Interior to permit full utilization of the lands above described;

and, in exchange for such parcels of land, to convey to the owner or owners thereof all right, title, and interest of the United States in and to the following described parcels of land within the Everglades National Park:

Tract “L” and block 34, comprising 9.09 and 1.65 acres, respectively, lying in or in the vicinity of Everglades City, Florida.